760.41

[Hv&Lv]

This will be my stupid question of the day...
Article 760.41, locking a fire alarm breaker in the on position.
I have a drawing from a PE showing the fire alarm circuit in a panel with a locking breaker.

The breaker is in a sub panel.

I can see where a locked “on” breaker in a main panel can still have no voltage with the main off, you will know all power is off.
In a sub panel there is the possibility of the breaker feeding it to be flipped off and someone may not realize it’s off, depending on what is fed from the sub panel.

I don’t find anything that says it can’t be done, or did I miss it somewhere?

 

[roger]

True but the FAP will (should) go into a non-silenceable trouble alarm showing loss of power.

Roger

 

[Hv&Lv]

True but the FAP will (should) go into a non-silenceable trouble alarm showing loss of power.

Roger

Which sort of led me to why have a locking breaker in the first place?
You will about know instantly when you flipped the wrong breaker off.

 

[roger]

Which sort of led me to why have a locking breaker in the first place?
You will about know instantly when you flipped the wrong breaker off.

But for sake of conversation, say in the case of a hospital, a service man could be saved from creating a problem with the lock in place.

Roger

 

[Hv&Lv]

But for sake of conversation, say in the case of a hospital, a service man could be saved from creating a problem with the lock in place.

Roger

Ahhh, yes.
my thinking wasn’t large enough.
I was thinking about a residential group home setting.